UTM Builder
Analytics only groups traffic correctly when your tags are spelled identically every time — "Facebook" and "facebook" become two separate sources. This normalizes the tags, warns about the mistakes that split reports, and keeps a library of the links you have already built.
Free, runs entirely in your browser. No account, no usage limits, and nothing you type is uploaded.
Questions
Why force lowercase?
UTM values are case sensitive in every major analytics tool, so Email and email appear as two unrelated sources and split your numbers in half.
Should I put UTMs on internal links?
No. Tagging a link between two pages of your own site starts a new session and overwrites the original source, destroying the attribution you were trying to measure.
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